CN-121988470-A - Multi-feedback channel fluid oscillator

Abstract

The invention provides a multi-feedback channel fluid oscillator, which belongs to the technical field of fluid injection devices and comprises an oscillation cavity, an inlet, a nozzle and at least three feedback channels, wherein the inlet is arranged at one end of the oscillation cavity, the nozzle is arranged at the other end of the oscillation cavity, the nozzle and the inlet are arranged opposite to each other along the central axis of the oscillation cavity, the feedback channels are circumferentially distributed around the central axis of the oscillation cavity, and each feedback channel is provided with a feedback channel inlet and a feedback channel outlet. According to the invention, through the configuration design of the multi-feedback channel, the fluid can form feedback control flow by virtue of the feedback channel, the fluid entering the oscillation cavity through the inlet is enabled to flow and be switched along a plurality of directions of the oscillation cavity by virtue of the coupling effect of the fluid coanda effect and the multi-channel backflow feedback, and finally, a multi-directional sweeping self-excited oscillation jet flow is formed at the nozzle, so that the space coverage range and the atomization efficiency of the jet flow are greatly improved.

Inventors

• Dong Haoqiang
• SUN HAIJUN
• LIU YANG
• HU XIAOAN
• YANG SHUCHENG
• Wang Hezihan
• HU WANLU
• LUO KUN
• You Gaojian

Assignees

• 南昌航空大学

Dates

Publication Date

20260508

Application Date

20260323

Claims (10)

1. 1. The utility model provides a many feedback channel fluid oscillator, its characterized in that, including oscillation cavity (1), import (2), spout (3) and at least three feedback channel (4), import (2) set up in the one end of oscillation cavity (1), spout (3) set up in the other end of oscillation cavity (1), spout (3) set up along the central axis of oscillation cavity (1) with import (2), feedback channel (4) encircle the central axis circumference distribution of oscillation cavity (1), each feedback channel (4) all are equipped with feedback channel entry (41) and feedback channel export (42), feedback channel entry (41) are close to one side intercommunication of import (2) with oscillation cavity (1), feedback channel export (42) are close to one side intercommunication of spout (3) with oscillation cavity (1), the circulation cross-section of import (2) and oscillation cavity (1) is formed with import throat (21).
2. 2. The multi-feedback channel fluidic oscillator according to claim 1, characterized in that the number of feedback channels (4) is an odd number of three or more, and the feedback channels (4) are evenly distributed circumferentially along the central axis of the oscillation cavity (1).
3. 3. A multi-feedback channel fluidic oscillator according to claim 1, characterized in that the ratio of the through-flow cross-sectional area of the feedback channel (4) to the through-flow cross-sectional area of the inlet throat (21) is 0.5-1.5.
4. 4. Multi-feedback channel fluidic oscillator according to claim 1, characterized in that the structure of the oscillation cavity (1) is a rotationally symmetrical structure around its central axis.
5. 5. The multi-feedback channel fluidic oscillator according to claim 4, characterized in that the structural unit between the oscillation cavity (1) and the feedback channel (4) is a rotary monomer.
6. 6. The multi-feedback channel fluidic oscillator of claim 5, characterized in that each revolution monomer thickness of the oscillation cavity (1) is no greater than 2 R Sin (180/n) °, where R is the radius of the cross section of the inlet throat (21) and n is the number of feedback channels (4).
7. 7. The multi-feedback channel fluidic oscillator according to claim 6, wherein the inlet (2) is cylindrical, the through-flow cross-section of the spout (3) is star-shaped, and the through-flow chamber of the spout (3) is of diverging configuration, the through-flow cross-section of which increases gradually in a direction away from the oscillation chamber (1).
8. 8. The multi-feedback channel fluidic oscillator according to claim 1, wherein the oscillating cavity (1), inlet (2), spout (3) and feedback channel (4) are manufactured in an additive manufacturing manner or in a split milling and welding manner.
9. 9. Multi-feedback channel fluidic oscillator according to claim 1, characterized in that the number of feedback channels (4) is three or five.
10. 10. Multi-feedback channel fluidic oscillator according to claim 9, characterized in that the oscillation cavity (1) is of triple or quintuple rotationally symmetrical structure about a central axis.

Description

Multi-feedback channel fluid oscillator Technical Field The invention belongs to the technical field of fluid injection devices, and particularly relates to a multi-feedback channel fluid oscillator. Background The self-excited fluid oscillator is a fluid control device based on the fluid coanda effect, does not need any additional movable parts, can generate self-excited and self-maintained sweep jet flow at an outlet only by means of self-flow channel configuration design and self-flow characteristics of fluid, has the advantages of simple structure, high reliability, strong robustness and the like, and is widely focused and applied in the fields of fuel atomization, fluid injection, active flow control and the like. The main flow self-oscillation fluid oscillator mainly adopts a double feedback channel configuration, and has the core principle that after fluid enters an oscillation cavity through an inlet, the fluid is randomly attached to one side cavity wall to flow under the coanda effect, and under the flow limiting effect of an outlet, part of the fluid enters a feedback channel on the corresponding side to form a reflux control flow, then a separation bubble is formed in a coupling cavity, the main fluid is pushed to deflect towards the other side cavity wall, and the reciprocating sweep jet flow is finally formed at the outlet. However, the oscillator with the configuration can only realize the reciprocating sweep in a plane, the space coverage of jet flow is extremely limited, and the engineering requirements of multidirectional uniform atomization and full circumferential mixing cannot be met. In summary, it is difficult to simultaneously consider the jet space coverage, the wide working condition oscillation stability, the atomization mixing efficiency and the structural compactness of the existing self-excited oscillation fluid oscillator, and the application requirement of high-end equipment on the high-performance fluid oscillation device cannot be met, so that development of a novel self-excited sweep fluid oscillator capable of realizing multi-directional sweep is needed. Disclosure of Invention (1) Technical problem to be solved Aiming at the defects of the prior art, the invention aims to provide a multi-feedback channel fluid oscillator so as to solve the problems that the prior self-oscillation fluid oscillator adopts a double-feedback channel configuration, can only realize reciprocating sweep in a plane, has extremely limited space coverage range of jet flow, and cannot meet the engineering requirements of multidirectional uniform atomization and full circumferential mixing. (2) Technical proposal In order to solve the technical problems, the invention provides a multi-feedback-channel fluid oscillator which comprises an oscillation cavity, an inlet, a nozzle and at least three feedback channels, wherein the inlet is arranged at one end of the oscillation cavity, the nozzle is arranged at the other end of the oscillation cavity, the nozzle and the inlet are arranged opposite to each other along the central axis of the oscillation cavity, the feedback channels are circumferentially distributed around the central axis of the oscillation cavity, each feedback channel is provided with a feedback channel inlet and a feedback channel outlet, the feedback channel inlet is communicated with one side, close to the inlet, of the oscillation cavity, the feedback channel outlet is communicated with one side, close to the nozzle, of the oscillation cavity, and an inlet throat is formed in the flow section of the inlet and the oscillation cavity. Preferably, the number of the feedback channels is an odd number of three or more, and the feedback channels are uniformly distributed along the circumferential direction of the central axis of the oscillation cavity. Preferably, the ratio of the through-flow cross-sectional area of the feedback channel to the through-flow cross-sectional area of the inlet throat is 0.5-1.5. Preferably, the structure of the oscillation cavity is a rotationally symmetrical structure around the central axis of the oscillation cavity. Preferably, the structural unit between the oscillation cavity and the feedback channel is a rotary monomer. Preferably, each rotary monomer of the oscillation cavity has a thickness of not more than 2RSin (180/n) °, where R is the radius of the inlet throat section and n is the number of feedback channels. Preferably, the inlet is cylindrical, the through-flow section of the nozzle is star-shaped, and the through-flow cavity of the nozzle is of a divergent structure, and the through-flow section of the through-flow cavity is gradually increased along the direction deviating from the oscillating cavity. Preferably, the processing mode of the oscillation cavity, the inlet, the spout and the feedback channel is an additive manufacturing mode or a split milling and welding mode. Preferably, the number of feedback channels is three or five. Prefera